Continuity mistake: Early in the swim to the ocean, salmon Scruffy is eaten by Zoidberg. Later, during the the swim back to the stream, Scruffy is seen with the group, just behind Leela and Fry.
Futurama (1999)
1 continuity mistake in Naturama
Starring: John DiMaggio, Katey Sagal, Tress MacNeille, Billy West, Lauren Tom
Continuity mistake: When Fry falls into the cryogenic chamber his whistle drops right next to the chair. When it cuts, the whistle is gone. (00:01:50)
Lucy Liu-bot: I will never forget you, Philip J. Fry. Memory deleted.
Trivia: The robot devil is voiced by Dan Castellaneta, the voice of Homer Simpson.
Answer: You are thinking about episode 20 of series 2 - "Anthology of Interest I". She technically never kills anyone, but in the episode she ask a "What if machine" (one of the Professor's inventions) what would happen if she was more impulsive. The machine then shows the more impulsive Leela killing off the Professor to get the money from his will and thereafter killing Hermes, Bender, Scruffy, Cubert, Nibler, Amy and Zoidberg to cover it up. Finally she does something really impulsive with Fry.
Andreas[DK]